北京大学朱瑞团队报道了高米勒指数晶面的共格生长增强了钙钛矿太阳能电池。相关研究成果于2024年10月14日发表在《自然》。

获得高质量的微米厚钙钛矿薄膜是实现高效稳定的正（p）-本征（i）-负（n）钙钛矿太阳能电池的关键，但这仍然是一个关键挑战。

该文中，研究人员报告了一种通过形成相干晶界来生产高质量、微米厚甲脒基钙钛矿薄膜的有效方法，其中高米勒指数取向的晶粒在稳定的气氛中在低米勒指数取向晶粒上生长。

所得微米厚的钙钛矿薄膜具有增强的晶界和晶粒，显示出稳定的材料性能和出色的光电性能。

小面积太阳能电池的效率为26.1%。1cm²器件和5cm×5cm最小模块的效率分别为24.3%和21.4%。

在稳定气氛中处理的器件在所有季节都具有很高的再现性。封装器件在环境空气中的光和热应力下均表现出优异的长期稳定性。

附：英文原文

Title: Coherent growth of high-Miller-index facets enhances perovskite solar cells

Author: Li, Shunde, Xiao, Yun, Su, Rui, Xu, Weidong, Luo, Deying, Huang, Pengru, Dai, Linjie, Chen, Peng, Caprioglio, Pietro, Elmestekawy, Karim A., Dubajic, Milos, Chosy, Cullen, Hu, Juntao, Habib, Irfan, Dasgupta, Akash, Guo, Dengyang, Boeije, Yorrick, Zelewski, Szymon J., Lu, Zhangyuchang, Huang, Tianyu, Li, Qiuyang, Wang, Jingmin, Yan, Haoming, Chen, Hao-Hsin, Li, Chunsheng, Lewis, Barnaby A. I., Wang, Dengke, Wu, Jiang, Zhao, Lichen, Han, Bing, Wang, Jianpu, Herz, Laura M., Durrant, James R., Novoselov, Kostya S., Lu, Zheng-Hong, Gong, Qihuang, Stranks, Samuel D., Snaith, Henry J., Zhu, Rui

Issue&Volume: 2024-10-14

Abstract: Obtaining micron-thick perovskite films of high quality is key to realizing efficient and stable positive (p)-intrinsic (i)-negative (n) perovskite solar cells1,2, but it remains a critical challenge. Here, we report an effective method for producing high-quality, micron-thick formamidinium-based perovskite films by forming coherent grain boundaries, where high-Miller-index-oriented grains grow on the low-Miller-index-oriented grains in a stabilized atmosphere. The resulting micron-thick perovskite films, with enhanced grain boundaries and grains, showed stable material properties and outstanding optoelectronic performances. The small-area solar cells achieved efficiencies of 26.1%. The 1-square-centimeter devices and 5 cm × 5 cm minimodules delivered efficiencies of 24.3% and 21.4%, respectively. The devices processed in a stabilized atmosphere presented a high reproducibility across all four seasons. The encapsulated devices exhibited superior long-term stability under both light and thermal stressors in ambient air.

DOI: 10.1038/s41586-024-08159-5

Source: https://www.nature.com/articles/s41586-024-08159-5